All language subtitles for 3 - MERN A First Overview English

So we learned about the individual technologies, what's the big picture

and how do these things work together?

Now we can differentiate between the frontend and the backend

if we want to or client and server. What happens on the client is our frontend,

what happens on the server side is our backend

and on the client, we use Javascript or specifically React.js to build an amazing user interface.

On the server side,

we use Node, Express and MongoDB.

Now we use Javascript here for the presentation and the user interface,

we will build a single page application with it and I will come back to that later in the course and

on the server side,

we have all our server side business logic.

We can store data persistently, either in files or in a database,

we also implement our authentication logic there for example

and technically on the server, we even can split Node, Express from MongoDB because as you will learn

throughout the course, MongoDB will actually also run on its own server, its own machine but it all happens

outside of the browser,

so I all consider this to be the backend.

Now that of course leaves us with the question how client and server communicate

and that will happen with help of requests and responses, HTTP requests and responses which are exchanged

between these two ends.

We will send background HttpRequests from inside our React Javascript app to our server side

to our Node Express application and this application will then reply with responses and we will also

exchange data, typically in the JSON format.

This is how this will generally work together,

this is how this will be connected but we will have an entire theory module where we will take a closer

look at this

and then of course we have a huge course project which we build from scratch where we will build all

these different areas, where we will build the frontend and the backend and connect to a database and

so on and there, you will of course also see all these things come together.